1. insufficient - Adjective
2. insufficient - Determiner
Not sufficient; not enough; inadequate to any need, use, or purpose; as, the provisions are insufficient in quantity, and defective in quality.
Wanting in strength, power, ability, capacity, or skill; incompetent; incapable; unfit; as, a person insufficient to discharge the duties of an office.
Source: Webster's dictionarySociety is like the air, necessary to breathe but insufficient to live on. George Santayana
Life is the art of drawing sufficient conclusions from insufficient premises. Samuel Butler (novelist)
Life is made up of a series of judgments on insufficient data, and if we waited to run down all our doubts, it would flow past us. Learned Hand
Common experience is the gold reserve which confers an exchange value on the currency which words are; without this reserve of shared experiences, all our pronouncements are cheques drawn on insufficient funds. René Daumal
But pain... seems to me an insufficient reason not to embrace life. Being dead is quite painless. Pain, like time, is going to come on regardless. Question is, what glorious moments can you win from life in addition to the pain? Lois McMaster Bujold
The alcohol that is insufficient for a whole town ought not to intoxicate one man. Nigerian Proverb